Evaporator.



PATENTED MAY 7, 1907.

F. s. HEATH.

EVAPORATOR.

APPLIOATION FILED MAY 29, i906.

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FRANK S. HEATH, OF CURRY, PENNSYLVANIA.

EVAPORATOR.

Specification of Letters Patent.

Patented May '7, 1907.

Application filed May 29, 1906. Serial No 319.368.

To all whom it may concern:

Be it known that I, FRANK S. I'IEATII, a citizen of the United States,residing at Corry, in the county of Erie and State of Pennsylvania, haveinvented certain new and useful Improvements in Evaporators; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,forming part of this specification.

My invention relates to evaporators, and more especially to that classof evaporators for use in making maple syrup and sugar from the sap ofmaple trees, although it may be used in evaporating liquids of any kind.

The object of my invention is the construction of an evaporator havingcircula tion pipes connected to the primary evapo rating pan in such amanner as to expose the largest amount of heating surface possible andat the same time permit of constant circulation of the liquid beingevaporated.

The features of my invention are hereinafter set forth and explained,and are illustrated in the accompanying drawings, in which:

Figure 1 is a top or plan view of an evaporator embodying my invention.Fig. 2 is a longitudinal section of the evaporator body on the line:r-:1: in Fig. Fig. 3 is a transverse section of the same on the line gy in Fig. 1. Fig. 4 is a transverse section on the line z/'y in Fig. 1,showing a modified construction of my invention. Fig. 5 is a side viewof the primary evaporating pan, showmg said modified construction ofcirculation pipes.

.In these drawings A indicates the furnace body of an ordinaryevaporator, B the primary pan, and C & D the secondary pans.

In carrying out my invention I constructthe primary pan B with openingsin the bottom along each side edge thereof; and in these openings Isecure a series of U-shaped circulation pipes E one side 6 of which islonger than the opposite side 6, see Fig. 3. These U-shaped circulationpipes E extend downward into the lire-box of the evaporator furnace Afar enough so that the portions 6 thereof may, if desired, form thegratebars for the fire-box. These U-shaped circulation pipes may besecured in the bottomplate of the pan B by any well known means,

i l l l l i l but I preferably secure them therein by formingscrew-tln'eads on the ends of said U- shaped circulation pipe and thensecure them in the openings in the bottom of the pan B by means of a nutbelow and above the bottom plate of said pan, with asbestos or otherpacking between one of the nuts and the pan.

In Figs. 4 & I show an alternative construction of my invention, inwhich the portions 0 of the circulation pipes are secured in the pan attheir upper ends and their lower ends are secured in a trunk F, and theportions c of said circulation pipes lead from the side of thetrunk Facross to the opposite side of the fire box and then up to the pan B.From the bottom of the trunks F a drain pipe leads to a cockf by meansof which the circulation pipes and trunks may be drained when the pan isemptied, which does away with the necessity of tip' ing the pan bottomside up, as in the construction shown in Figs. 1,2 & 3. l have shown thecirculation pipes E as having one side longer than the opposite side,thereby necessitating the middle or transverse portion of the duct tolie in an ascending position from the long side to the short side of thecirculation pipe. This is desirable in order to give an upward flow tothe liquid from the lowest point ol the circulation pipe. The secondarypans C & D are for the purpose of evaporating the syrup after it hasbecome too dense to be exposed to the direct heat over the lire-box.

In operation the sap is ilirst placed in the pan B filling thecirculation pipes E-therewith. Fire is then placed in the lire-box,preferably upon the portions 0 of the U- shaped circulation pipes E, andas the portions c and. c" thereof are nearer the fire than the portions6, the sap therein becomes hotter and "flows in the direction of thearrows in Figs. 2, & 4, thereby causing a rapid circulation in saidcirculation pipes. By means of this invention I am enabled to evaporatethe maximum quantity of sap while consuming a minimum quantity of fuel,with no danger of scorching the same. I

Having thus fully described. my invention, so as to enable others toconstruct and operate the same, what I claim is:

1. In an evaporator the combination of a furnace body, an evaporator panover said furnace body, and a series of U-shaped circulation pipes,having both ends thereof in communication with the interior of said pan,and

their intermediate portions extending downward into the said fiunacebody, substantially as described.

2. In an evaporator, the'combination of a i furnace body, an evaporatorpan over said furnace body, and a series of circulation pipescommunicating with the interior of said pan l extending downward intothe fire-box of said i furnace body, the upright portions of each of lsaid circulation pipes being longer on one 1 side than on the oppositeside and the portion of said ducts connecting the upright portions beingtransverse of said fire-box, substantially as described.

3. I11 an evaporator the combination of a furnace body, a fire-boxtherein, an evaporator pan over said fire-box, having two rows ofalternate openings on the bottom of said pan adjacent to each sidethereof, and a se ries of U-shaped ducts extending downward into saidfire-box connecting the outer of each of said openings in the bottom ofsaid pan with each of the inner openings on the opposite side of saidpan, substantially as set forth.

4. In an evaporator the combination of a furnace body, a fire-boxtherein, an evaporator pan over said firebox, having a series ofdown-flow openings arranged adjacent to each side thereof and a seriesof up-flow openings arranged inside of each of said series of down-flowopenings, and a series of circulation pipes connecting each of saiddown-flow openings with the opposite up-flow openings, the down-flowportion of said pipes being longer than the up-flOw portion thereof,substantially as set forth.

In testlmony whereof I affix my slgnature, in presence of two witnesses.

FRANK S. HEATH.

Witnesses:

E. Loursn ELLswoRTH, G. R. POWELL.

